189 Background: The use of medical cannabis (MC) for palliation of symptoms is on the rise in cancer and rheumatological patients. Whether there is a potential for opioid dose reduction (ODR) and or quality of life improvements (QOL) is unclear. Methods: A retrospective cohort was evaluated to understand the pattern of care and QOL outcomes with MC use across rural multidisciplinary practices in New Mexico. MC use (> 1 mo.), EMR interrogation, urine toxicology screening were used to identify patients. QOL questionnaire included a graded pain scale. Morphine equivalent (ME) dose was used to estimate changes in opioid dose. ODR was defined as any reduction of baseline opioid dose. A chi-square was performed to evaluate associations. Results: A total of 133 patients were identified between Jan 2017- May 2017. (M/F) 65/68; median age of 53 (range 20 - 84). Nineteen percent (25/133) had a cancer diagnosis. Pain score improved in 80 % of patients with cancer and in 75% (64/89) of non-cancer patients (x2 0.24 p = 0.62). ODR was achieved in 41% (54/133) of all patients on MC. Of these, 63% (34/54) had a 25% ODR and 37% (20/54) had 26% or more ODR (x2 12.8 p = 0.002). In cancer patients, a 25% ODR was achieved in 73% (x2 0.51 p = 0.771). All patients (15/15) using MC and high dose opioid (morphine equivalent ≥ 50 mg/day) had some ODR. Co-adjuvant NSAIDs with MC improved pain score in 67% of all cases vs 33% among non-NSAID cohort (x2 10.7 p = 0.001). ODR was achieved in 32% of patients with active depression vs 68% of patients without (x2 0.044 p = 0.83). Conclusions: In this rural cohort, MC use led to ODR in 41% of all patients. Depression was a negative predictor of ODR. NSAID use facilitated ODR. It will be important to assess MC toxicity before considering this intervention. This study did not include toxicity data due to the retrospective nature of this study and its inherent limitations. Prospective data are needed to confirm these findings.

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569 Background: Women with unilateral breast cancer (BC) without genetic predisposition have a low risk for local and contralateral recurrence with breast conservation surgery (BCS) and adjuvant treatment. We aimed to study the pattern of surgical care across centers in rural New Mexico and its correlation to clinical outcomes. Methods: We retrospectively evaluated 533 patients with Stage 1-3 BC diagnosed between January 1989 to October 2015. Clinical Outcomes with BCS, sentinel lymph node dissection (SLND), simple mastectomy (SM), modified radical mastectomy (MRM) and Bilateral Mastectomy (BM) were studied. Descriptive statistics were performed to describe the proportion of surgery types. Predictors of clinical outcomes were evaluated by multivariate logistic regression. Results: Out of 533 patients, 510 (82%) had early stage (0-3) resectable BC. Among these, 48% (246/510) had either MRM (209/510) or BM (37/510). MRM was performed in 3% of stage 0 (6/209), 23% (49/209) stage I, 46%(97/209) of stage II and 27% (57/209) of Stage III patients. Overall, the rate of SLND was 42% among Early stage Breast cancer. Of 41 patients treated with bilateral mastectomy, 10 were positive for BRCA mutation, 6 for family history and 3 for contralateral disease. Median age of BM was 53 +12 y. The local recurrence rate was 8.8% (45/510), and metastatic recurrence rate was 15.5% (79/510). Lymphedema rate was 9.2% (47/510). Using MRM as reference, the Odds Ratio (OR) for lymphedema after BM and BCT were 2.15 (95% CI, 0.84-5.50) and 0.58 (0.28-1.22), respectively. With 9.6 years of median follow up, the predictive probabilities of lymphedema after BCT, SM, MRM and BM were 1%, 4%, 9% and 18%. The OR for local recurrence in women with BCT were 1.46 (95th C/I: 0.72-2.95), SM 0.27 (0.03-2.13), BM 2.06 (95th C/I:0.70-6.06). Conclusions: Less BCT and more aggressive procedures are being performed, and the latter is associated with more lymphedema. No significant differences were noted in local recurrences. Presence of a genetic mutation was not the sole indicator of BM’s in our patient population. There is a need for evidence-based shared decision-making and surgical management of breast cancer, especially in a rural community setting.

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